I'd not heard of it until it was talked about on ABC RN. The Theramin is the first electric, or electronic if you like, music machine. It was invented by a Russian Doctor by the name of Leon Theramin. It has long been used for horror movie sound tracks and while I suppose modern electronic machines can do wonderful things, the Theramin is still used today.
Do you want to hear something modern that uses a Theramin? Click here.